I'm wondering if It might be a permissions issue. If so, I think the device console should indicate that.
You mentioned that these were 3.7 PG Build apps -- I'd suggest:
- Upgrade to PG Build CLI 6 (you can do this in your config.xml)
- Make sure that the plugin you are using is up-to-date.
Before attempting it with your app, I'd suggest doing something very simple just so you can verify that the plugin works as expected, and then make the necessary changes to your app (since the move from 3.7 to 6 will probably need code changes on your part).